herdman



(No-Model.) 4 Sheets-Sheet 1. P. E. HERDMAN. ELECTRIC MOTOR PROPELLED ELEVATOR.

. No. 530,619. Patented Dec. 11, 1894.

(No Model.) 4 Sheets-Sheet 2.

P. E. HERDMAN. ELEGTRIG MOTOR PROPELLED ELEVATOR.

No. 530,619; tented Dec. 11, 1894.

(No Model) 4 SheetsSheet 3.

P. E. HERDMAN.

ELEGTRIGMOTOR PROPELLED ELEVATOR. N0. 530,619. Patented Dec. 11,1894.

077 155 6E6. //7//7 ro/Px MQ- M (No Model.) 4 Sheets-Sheet 4.

F. E. HERDMAN. ELECTRIC MOTOR PROPBLLED ELEVATOR.

No. 580,619. Patented Dec. 11,1894.

yfkflogl M (512% UNITED STATES PATENT OFFICE.

FRANK E. HERDMAN, OF INDIANAPOLIS, INDIANA.

ELECTRIC-MOTOR-PROPELLED ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 530,619, dated December 11, 1 894. Application filed January 31,1893. Serial No. 460,466. (No model.)

To all whom it may concern.-

Be it known that I, FRANK E. HERDMAN, a citizen of the United States, residing at Indianapolis, county of Marion, and State of Indiana, have invented a new and useful Improvement in Electric-Motor-Propelled Elevators, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, which form a part of this specification.

My improvement relates to elevators which are propelled by electric motors, and it consists essentiallyin certain mechanism and arrangement of circuits whereby, if the elevator becomes overloaded, the current in the field is increased and the strength of the fields thus increased and also, in case the elevator becomes excessively overloaded, the current is cut on and the motor stopped.

It also consists in certain mechanism which, if for any cause the car should be caught in the shaft, thereby throwing the weight of the entire counterbalance on the lifting mechanism, the elevator operating mechanism will be stopped.

I will describe my invention as applied to an elevator with which it is well adapted to be used, although I do not intend to limit myself to the detailed mechanism of this particular elevator.

In the drawings-Figure 1 is a side elevation. Fig. 2 is a plan view. Fig. 3 is a detached perspective view of portion of mechanism for stopping elevator mechanism when the car becomes caught in the shaft. Fig. 4 is a detached perspective view of portion of mechanism for controlling and stopping the elevator mechanism when the car becomes overloaded. Fig. 4 is a diagrammatic view by rods F F to the casing or frame work of the machine. Between these rods is a crosshead H, provided with the rollers I I, which travel upon said rods F F. To the crosshead H is attached the rod, J, threaded at one end and on which threaded end the not B works.

75 is a shaft secured to the crosshead II by frame K It. On this shaft 7c are placed the sheaves K.

It can readily be seen, as the motor operates in either direction, the revolution of the nut B causes the screw J to travel in one direction or the other, according to the direction of the motor, which moves the cross head H in the corresponding direction, and with itthe traveling sheaves K. Lifting cables from the car pass down from overhead sheaves around one of the sheaves E and back and around one of the sheaves K, then around the next sheave E, and continues thus until the desired gear of the machine is obtained, the cables being firmly attached to a lever a, fulcrumed at b and connected to the frame work carrying the sheaves, the cables being attached to the lever at point 0. Supported on the rod d, which forms the connection between the cables and lever a, is a spring d, said spring being set to the desired load to be lifted and in case that load be exceeded this tension spring is compressed in proportion to said overload. To the upper end of this lover, a, is attached the rod, e, which extends to the operating sheave A, at which point said rod has a slot,f, surrounding a pin, g, on said operating sheave. The slot, f, is of such length as to permit the full throw of the operating sheave in either direction without the pin, g, striking the end of slot, f, under normal conditions. If however the sheave is thrown for the elevator to ascend and the load in the car is above the prearranged desired amount, the rod e, is carried to the right and the operating sheave is drawn toward the center, thereby, if the elevator is sufficiently overloaded, operating the switch, cutting off the current and stopping the elevator.

In Fig. 5 are shown the electric current connections, Fig. 5 being a diagrammaticalview.

The and represent the wires leading from the positive and negative poles of the battery or other source of current supply.

52 is the motor controlling switch having the contacts 53 and 54 and the brushes 55 and 56.

57 is the armature of the motor and 58 the fields. Upon these fields are a number of extra coils 1, 2, 3, (three being shown.)

59 are resistances.

60 is an arm carrying a brush adapted to travel over the resistances. To this arm 60 is attached the projecting arm 61, one end of which is connected to solenoid 62, the other end to dash pot 63.

64 is a secondary switch having contacts 65, 66 and 67 and 68. The contacts 66, 67 and 68 are connected each with one of the extra coils on the field, and contact is connected to wire of field, as return wire. The arm 64 has a brush 70, adapted to travel over the contacts 65, 66, 67, 68, and the rod, e, extended beyond the operating sheave, is connected to said arm 64. The contact 53 is in electrical connection with one pole of the source of current supply and the other pole of source of current supply is connected with contact, 72, on arm 69. The arm 60 has a contact 71 in electrical connection with one pole of the armature. The other pole of the armature is connected with brush 56. Brush 55 isin electrical connection with resistances 59. Brush 56 is in electrical connection with the armature. Contact 54 is in electrical connection with contact 65. As may be seen, unless the brush of arm 64 is in contact with contact 65, the armature current is flowing through the extra field wires and when the brush is in contact with contact 66 one extra wire (1) of the field is energized. lVith contact 67 the wires (1 and 2) are energized and with contact 68. Three extra wires (1,2, 3) are energized, and this can be carried to any desired limit by increasing the number of contacts and the number of extra windings on the field. As may be seen, when the spring is compressed and the rod, e, drawn to the right, the arm 64 is drawn to the right through the extra coils, one or more, dependent on the extent of the movement of rod, 6, into action, and strengthening the fields accordingly, thus giving the motor greater strength to overcome the extra load. This strengthening of the field will continue until the spring, (Z, is sufficiently compressed to throw the rod, e, a distance sufficient to bring the operative sheave to the center and cut off the current.

The counterbalancing mechanism is as follows: To the shaft, 7t, carried by the crosshead, II, on either side are placed the sheaves, L, and upon a shaft to the rear of the crosshead are placed the sheaves, M. Upon each end of the shaft carrying the sheave, E, are placed sheaves, N. A cable or cables (preferably two) pass from a counterbalance 30, around the sheaves 31 and 29, down from the top of the shaft, around the sheaves N and M, thence around the sheaves L and continue around these two sets of sheaves L and M until the desired gear is made, the ends of the cables being attached to the levers, t', on shaft 1'', to which is also attached lever The spring Z acts on lever 1.

The counterbalance used is in excess of the weight of the car. In ascending, the motor lifts the excess of the weight of the car and contents over the weight of the counterbalance. In descending, the motor lifts the excess of the weight of the counterbalance over the weight of the car and contents, which, of course, will be nothing if the weight of the car and contents be in excess of the counterbalance.

In ascending, if the car be overloaded or becomes caught in the shaft, the extra strain on the lifting cables operates the mechanism, as before described; but if the car should become caught in descending, then no portion of the weight of the counterbalance being counteracted bythe weight of the car and contents, the whole weight of the counterbalance is thrown on the lever 6 and the spring Z, not being able to sustain the strain would be compressed, causing the lever i to move to the left, striking the end of the operating bar 51, which is connected to the operating sheave A, which would carry said bar to the left, returning the operating sheave to the center and stopping the machine.

Having now fully described my invention, what I claim, and desire to protectby Letters Patent, is

1. In an elevating apparatus, the combination with an electric motor provided with extra coils upon the field, contacts, each contact in electrical connection with one coil, and a return wire to one of said contacts, electric connection between said contact and source of current supply, an arm adapted to pass over said contacts, electrical connection between said arm and the source of current supply, traveling sheaves, lifting cable wound around said sheaves and connection between said lifting cable and said arm, adapted when the strain on said lifting cable is increased beyond normal to draw said arm over said contacts.

2. In an elevating apparatus the combination with an electric motor provided with extra coils in the field, a switch interposed be tween said coils and source of current supply and adapted to cut out said coils or admit current to one or more of said coils, traveling sheaves, lifting cable wound around said sheaves and connection between said lifting cable and said switch adapted when the strain on said lifting cable is increased beyond the normal to operate said switch and throw into action one or more of said extra coils.

3. In an elevating apparatus, the combination with an electric motor provided with extra coils in the field, a switch interposed between said coils and source of current supply and adapted to cut out said coils or admit current to one or more of said coils, traveling sheaves, lifting cables wound around said sheaves, a pivoted lever to which said cable IIC is connected, a spring acting upon said lever, a rod connected to said lever, said rod being also connected to said switch.

4. The combination with an electric motor provided with extra coils upon the field, contacts, each contact in electrical connection with one coil, and a return wire to one of said contacts, electric connection between said contacts and source of current supply, an arm adapted to pass over said contacts, electrical connection between said arm and the source of current supply, traveling sheaves, lifting cable wound around said sheaves, a pivoted lever to which said cable is connected, a spring acting upon said lever, a rod connected to said lever said rod being also connected to said arm.

5. In an elevating apparatus, the combination with an electric motor provided with extra coils upon the field, contacts, each contact in electrical connection with one coil, and a return wire to one of said contacts, electric connection between said contact and source of current supply, an arm adapted to pass over said contacts, electrical connection between said arm and the source of current supply, lifting cable and connection between said cable and said arm adapted when the strain upon said lifting cable is increased beyond normal, to draw said arm over said contacts.

6. In an elevating apparatus the combination with an electric motor provided with extra coils in the field, a switch interposed between said coils and source of current supply and adapted to out out said coils or admit current to one or more of said coils, lifting cable and connection between said lifting cable and said switch, adapted when the strain on said lifting cable is increased beyond the normal to operate said switch and throw into action one or more of said extra coils.

7. In an elevating apparatus, the combination with an electric motor provided with extra coils in the field, a switch interposed between said coils and source of current supply and adapted to cut out said coils or admit current to one or more of said coils, lifting cables, a pivoted lever to which said cable is connected, a spring acting upon said lever, a rod connected to said lever, said rod being also connected to said switch.

8. The combination with an electric motor provided with extra coils upon the field, contacts, each contact in electrical connection with one coil, and a return wire to one of said contacts, electric connection between said contacts and source of current supply, an arm adapted to pass over said contacts, electrical connection between said arm and the source of current supply, lifting cable, a pivoted lever to which said cable is connected, a spring acting upon said lever, a rod connected to said lever, said rod being also connected to said arm.

9. In an elevating apparatus, in combination with the operating sheave of the lifting cable, and connection between said sheave and the elevator power regulating mechanism, a pivoted lever to which said cable is connected, a spring acting upon said lever, a rod connected to said lever, said rod being provided with a slot which surrounds a pin upon the operating sheave.

10. In an elevating apparatus the combination of traveling sheaves, lifting cable wound around said sheaves, a pivoted lever to which said cable is connected, a spring acting upon said lever, a rod connected to said lever and connection between said rod and the elevator power regulating mechanism.

11. In an elevating apparatus, the combination with an operating sheave and connection between said sheave and the elevator power regulating mechanism, of traveling sheaves, lifting cable wound around said traveling sheaves, a pivoted lever to which said cable is connected, a spring acting upon said lever, a rod connected to said lever said rod being provided with a slot which surrounds a pin upon the operating sheave.

12. In an elevating apparatus the combination with a counterbalance cable of a lever to which said cable is attached, a spring acting upon said lever, elevator power regulating mechanism, and intermediate devices between said lever and the elevator power regulating mechanism adapted to be operated by said lever when the lever is moved.

13. In an elevating apparatus the combination of the elevator power regulating mechanism, an operating bar adapted to operate said mechanism, a counterbalancing cable, a lever to which said cable is attached, a spring acting upon said lever, an arm adapted to be operated by said lever to which cables are attached, said arm being in line with the operating bar.

14. In an elevating apparatus, the combination with an electric motor provided with extra coil in the field, of a switch interposed between said coil and the source of current supply and adapted to cut out or admit current to said coil, lifting cable and connection between said lifting cable and said switch, adapted when the strain on said lifting cable is increased beyond the normal to operate said switch and throw into action said extra coil.

In testimony of which invention I have hereunto set my hand.

FRANK E. HERDMAN. lVitnesses:

B. O. BAILEY, BEN P. GRAY.

IIC 

